| Allocapnia frisoni Ross & Ricker, 1964 | Evansville Snowfly |
| Allocapnia granulata Claassen, 1924 | Common Snowfly |
| Allocapnia illinoensis Frison, 1935 | Illinois Snowfly |
| Allocapnia indianae Ricker, 1952 | Indiana Snowfly |
| Allocapnia maria Hanson, 1942 | Two-knobbed Snowfly |
| Allocapnia minima Barnston, 1848 | Boreal Snowfly |
| Allocapnia mystica Frison, 1929 | Moraine Snowfly |
| Allocapnia nivicola Fitch, 1847 | Brook Snowfly |
| Allocapnia pechumani Ross & Ricker, 1964 | St. Lawrence Snowfly |
| Allocapnia pygmaea Burmeister, 1839 | Pygmy Snowfly |
| Allocapnia recta Claassen, 1924 | Eastern Snowfly |
| Allocapnia rickeri Frison, 1929 | Midwest Snowfly |
| Allocapnia vivipara Claassen, 1924 | Shortwing Snowfly |
| Allocapnia zola Ricker, 1952 | Ash Snowfly |
| Amphinemoura delosa | |
| Amphinemoura linda | |
| Amphinemura banksi Baumann & Ga..., 1972 | Rockies Forestfly |
| Amphinemura claassenia Wu, 1935 | |
| Amphinemura delosa Ricker, 1952 | Eastern Forestfly |
| Amphinemura linda (Ricker, 1952) | ⇒ Amphinemura palmeni Koponen, 1917 |
| Amphinemura nigritta Provancher, 1876 | Little Black Forestfly |
| Amphinemura palmeni Koponen, 1917 | Lovely Forestfly |
| Amphinemura standfussi Ris, 1902 | Small Brown |
| Amphinemura wui Claassen, 1936 | Spiked Forestfly |
| Arsapnia coyote Nelson & Bau..., 1987 | Coyote Snowfly |
| Arsapnia pileata Jewett, 1966 | Birdhead Snowfly |
| Arsapnia sequoia Nelson & Bau..., 1987 | Sequoia Snowfly |
| Arsapnia teresa Claassen, 1924 | Bernardino Snowfly |
| Arsapnia tumida Claassen, 1924 | Swollen Snowfly |
| Arsapnia utahensis Gaufin & Jewett, 1962 | Utah Snowfly |
| Bolotoperla rossi Frison, 1942 | Smoky Willowfly |
| Bolshecapnia gregsoni Ricker, 1965 | Alpine Snowfly |
| Bolshecapnia maculata Jewett, 1954 | Spotted Snowfly |
| Bolshecapnia milami Nebeker & Ga..., 1967 | Glacier Snowfly |
| Bolshecapnia rogozera Ricker, 1965 | Moosehorn Snowfly |
| Bolshecapnia sasquatchi Ricker, 1965 | Sasquatch Snowfly |
| Bolshecapnia spenceri Ricker, 1965 | Ice Snowfly |
| Calileuctra dobryi Shepard & Ba..., 1995 | Elsmere Needlefly |
| Capnia affinis Morton, 1896 | Huckleberry |
| Capnia atra Morton, 1896 | Huckleberry |
| Capnia barberi Claassen, 1924 | Plumas Snowfly |
| Capnia cheama Ricker, 1965 | Cheama Snowfly |
| Capnia coloradensis Claassen, 1937 | Colorado Snowfly |
| Capnia confusa Claassen, 1936 | Widespread Snowfly |
| Capnia elongata Claassen, 1924 | Cascades Snowfly |
| Capnia excavata Claassen, 1924 | Saddleback Snowfly |
| Capnia fialai Nelson & Bau..., 1990 | Humboldt Snowfly |
| Capnia giulianii Nelson & Bau..., 1987 | Whitney Snowfly |
| Capnia glabra Claassen, 1924 | Smooth Snowfly |
| Capnia gracilaria Claassen, 1924 | Slender Snowfly |
| Capnia hitchcocki Nelson & Bau..., 1987 | Arroyo Snowfly |
| Capnia inyo Nelson & Bau..., 1987 | Inyo Snowfly |
| Capnia lacustra Jewett, 1965 | Lake Snowfly |
| Capnia lineata Hanson, 1943 | Straight Snowfly |
| Capnia mariposa Nelson & Bau..., 1987 | Mariposa Snowfly |
| Capnia melia Frison, 1942 | Northwest Snowfly |
| Capnia mono Nelson & Bau..., 1987 | Mono Snowfly |
| Capnia nana Claassen, 1924 | Dwarf Snowfly |
| Capnia nana nana Claassen, 1924 | |
| Capnia nana wasatchae Nebeker & Ga..., 1967 | |
| Capnia nearctica Banks, 1918 | Nearctic Snowfly |
| Capnia ophiona Nelson & Bau..., 1987 | Snakehead Snowfly |
| Capnia palomar Nelson & Bau..., 1987 | Palomar Snowfly |
| Capnia petila Jewett, 1954 | Thin Snowfly |
| Capnia pileata (Jewett, 1966) | ⇒ Arsapnia pileata Jewett, 1966 |
| Capnia promota Frison, 1937 | Pacific Snowfly |
| Capnia quadrituberosa Hitchcock, 1958 | Four-knobbed Snowfly |
| Capnia regilla Nelson & Bau..., 1987 | Royal Snowfly |
| Capnia saratoga Nelson & Bau..., 1987 | Saratoga Snowfly |
| Capnia scobina Jewett, 1966 | Rasp Snowfly |
| Capnia sextuberculata Jewett, 1954 | Six-knobbed Snowfly |
| Capnia shasta Nelson & Bau..., 2009 | Shasta Snowfly |
| Capnia shepardi Nelson & Bau..., 1987 | Yuba Snowfly |
| Capnia spinulosa Claassen, 1937 | San Gabriel Snowfly |
| Capnia trava (Nebeker & Ga..., 1965) | ⇒ Utacapnia trava Nebeker & Ga..., 1965 |
| Capnia umpqua Frison, 1942 | Umpqua Snowfly |
| Capnia valhalla Nelson & Bau..., 1987 | Viking Snowfly |
| Capnia ventura Nelson & Bau..., 1987 | Ventura Snowfly |
| Capnia vernalis Newport, 1848 | Belly Snowfly |
| Capnia yosemite Nelson & Bau..., 1987 | Yosemite Snowfly |
| Capnura manitoba Claassen, 1924 | Manitoba snowfly |
| Capnura wanica Frison, 1944 | Intermittent Snowfly |
| Despaxia augusta Banks, 1907 | Autumn Needlefly |
| Doddsia occidentalis Banks, 1900 | Western Willowfly |
| Eucapnopsis brevicauda Claassen, 1924 | Short-tailed snowfly |
| Isocapnia abbreviata Frison, 1942 | Shortlimb Snowfly |
| Isocapnia agassizi Ricker, 1943 | Agassiz Snowfly |
| Isocapnia crinita Needham & Cl..., 1925 | Hooked Snowfly |
| Isocapnia eichlini Zenger & Bau..., 2004 | Napa Snowfly |
| Isocapnia grandis Banks, 1907 | Giant Snowfly |
| Isocapnia hyalita Ricker, 1959 | Hyalite Snowfly |
| Isocapnia integra Hanson, 1943 | Alberta Snowfly |
| Isocapnia mogila Ricker, 1959 | Irregular Snowfly |
| Isocapnia spenceri Ricker, 1943 | Chilliwack Snowfly |
| Isocapnia vedderensis Ricker, 1943 | Vedder Snowfly |
| Lednia tumana Ricker, 1952 | Meltwater Forestfly |
| Leuctra baddecka Ricker, 1965 | Maritime Needlefly |
| Leuctra biloba Claassen, 1923 | Two-lobed Needlefly |
| Leuctra duplicata Claassen, 1923 | Atlantic Needlefly |
| Leuctra ferruginea Walker, 1852 | Eastern Needlefly |
| Leuctra grandis Banks, 1906 | Grand Needlefly |
| Leuctra maria Hanson, 1941 | Lizard's tail |
| Leuctra sibleyi Claassen, 1923 | Brook Needlefly |
| Leuctra tenella Provancher, 1878 | Broad-lobed Needlefly |
| Leuctra tenuis (Pictet, 1841) | ⇒ Leuctra tenella Provancher, 1878 |
| Leuctra triloba Claassen, 1923 | Three-lobed Needlefly |
| Leuctra truncata Claassen, 1923 | Truncate Needlefly |
| Malenka californica Claassen, 1923 | California Forestfly |
| Malenka cornuta Claassen, 1923 | Horned Forestfly |
| Malenka flexura Claassen, 1923 | Twisted Forestfly |
| Megaleuctra stigmata Banks, 1900 | Giant Needlefly |
| Mesocapnia autumna Baumann & Ga..., 1970 | Autumn Snowfly |
| Mesocapnia bakeri Banks, 1918 | Pomona Snowfly |
| Mesocapnia bulbosa Nelson & Bau..., 1990 | Bulbous Snowfly |
| Mesocapnia oenone Neave, 1929 | Wine Snowfly |
| Mesocapnia ogotoruka Jewett, 1964 | Ogotoruk Snowfly |
| Mesocapnia porrecta Jewett, 1954 | Stretched Snowfly |
| Mesocapnia projecta Frison, 1937 | Spined Snowfly |
| Mesocapnia sugluka Ricker, 1965 | Sugluk Snowfly |
| Mesocapnia variabilis Klapálek, 1920 | Variable Snowfly |
| Mesocapnia yoloensis Baumann & Ga..., 1970 | Yolo Snowfly |
| Moselia infuscata Claassen, 1923 | Hairy Needlefly |
| Nemocapnia carolina Banks, 1938 | Southern Snowfly |
| Nemoura arctica Esben-Petersen, 1910 | Arctic Forestfly |
| Nemoura besametsa (Ricker, 1952) | ⇒ Prostoia besametsa Ricker, 1952 |
| Nemoura cinerea (Retzius, 1783) | ⇒ Amphinemura sulcicollis Stephens, 1836 |
| Nemoura delosa (Ricker, 1952) | ⇒ Amphinemura delosa Ricker, 1952 |
| Nemoura haysi (Ricker, 1952) | ⇒ Zapada haysi Ricker, 1952 |
| Nemoura linda (Ricker, 1952) | ⇒ Amphinemura palmeni Koponen, 1917 |
| Nemoura normani Ricker, 1952 | Alaska Forestfly |
| Nemoura rickeri Jewett, 1971 | Cencilla |
| Nemoura sahlbergi Morton, 1896 | |
| Nemoura trispinosa Claassen, 1923 | Three-spined forestfly |
| Nemoura weberi (Ricker, 1952) | ⇒ Podmosta weberi Ricker, 1952 |
| Oemopteryx fosketti Ricker, 1965 | Saskatoon Willowfly |
| Oemopteryx glacialis Barnston, 1848 | Canadian willowfly |
| Oemopteryx vanduzeea Claassen, 1937 | Seep Willowfly |
| Ostrocerca albidipennis Walker, 1852 | Whitetailed Forestfly |
| Ostrocerca complexa Claassen, 1937 | Notched Forestfly |
| Ostrocerca dimicki Frison, 1936 | Hooked Forestfly |
| Ostrocerca foersteri Ricker, 1943 | Cascades Forestfly |
| Ostrocerca prolongata Claassen, 1923 | Bent Forestfly |
| Ostrocerca truncata Claassen, 1923 | Truncate Forestfly |
| Paracapnia angulata Hanson, 1961 | Angulate Snowfly |
| Paracapnia humboldta Baumann & J...., 2007 | Redwood Snowfly |
| Paracapnia opis Newman, 1839 | Northeastern snowfly |
| Paraleuctra alta Baumann & Stark, 2009 | Alberta Needlefly |
| Paraleuctra divisa Hitchcock, 1958 | California Needlefly |
| Paraleuctra forcipata Frison, 1937 | Bullshorn Needlefly |
| Paraleuctra occidentalis Banks, 1907 | Western Needlefly |
| Paraleuctra purcellana (Neave, 1934) | ⇒ Pomoleuctra purcellana Neave, 1934 |
| Paraleuctra sara Claassen, 1937 | Appalachian Needlefly |
| Paraleuctra vershina Gaufin & Ricker, 1974 | Summit Needlefly |
| Paranemoura claasseni Baumann, 1996 | Boreal forestfly |
| Paranemoura perfecta Walker, 1852 | Boreal forestfly |
| Perlomyia collaris Banks, 1906 | Black Needlefly |
| Perlomyia utahensis Needham & Cl..., 1925 | Swamp loosestrife |
| Podmosta decepta Frison, 1942 | Least Forestfly |
| Podmosta delicatula Claassen, 1923 | Delicate Forestfly |
| Podmosta macdunnoughi Ricker, 1947 | Maritime forestfly |
| Podmosta weberi Ricker, 1952 | Holarctic Forestfly |
| Pomoleuctra andersoni Harper & Wil..., 1985 | Oregon Needlefly |
| Pomoleuctra purcellana Neave, 1934 | Purcell Needlefly |
| Prostoia besametsa Ricker, 1952 | Banded Forestfly |
| Prostoia completa Walker, 1852 | Central Forestfly |
| Prostoia similis Hagen, 1861 | Longhorn Forestfly |
| Shipsa rotunda Claassen, 1923 | Intrepid forestfly |
| Soyedina interrupta Claassen, 1923 | Broken Forestfly |
| Soyedina potteri Baumann & Ga..., 1971 | Rocky Mountain Forestfly |
| Soyedina producta Claassen, 1923 | Knobbed Forestfly |
| Soyedina vallicularia C.F.Wu, 1923 | Valley Forestfly |
| Soyedina washingtoni Claassen, 1923 | Vernal Forestfly |
| Strophopteryx fasciata Burmeister, 1839 | Little red stonefly |
| Taenionema atlanticum Ricker & Ross, 1975 | Atlantic Willowfly |
| Taenionema californicum Needham & Cl..., 1925 | California Willowfly |
| Taenionema grinnelli Banks, 1918 | Angeles Willowfly |
| Taenionema jeanae Baumann & C...., 2007 | Silverado Willowfly |
| Taenionema kincaidi Hoppe, 1938 | Pale Willowfly |
| Taenionema oregonense Needham & Cl..., 1925 | Oregon Willowfly |
| Taenionema pacificum Banks, 1900 | Pacific Willowfly |
| Taenionema pallidum Banks, 1902 | Common Willowfly |
| Taenionema raynorium Claassen, 1937 | Yosemite Willowfly |
| Taenionema uinta Stanger & Ba..., 1993 | Uinta Willowfly |
| Taeniopteryx burksi Ricker & Ross, 1968 | Eastern Willowfly |
| Taeniopteryx maura Pictet, 1841 | Spinyleg Willowfly |
| Taeniopteryx metequi Ricker & Ross, 1968 | Shortwing Willowfly |
| Taeniopteryx nivalis Fitch, 1847 | Boreal Willowfly |
| Taeniopteryx parvula Banks, 1918 | Hooked Willowfly |
| Utacapnia columbiana Claassen, 1924 | Columbian Snowfly |
| Utacapnia distincta Frison, 1937 | Distinctive Snowfly |
| Utacapnia labradora Ricker, 1954 | Labrador Snowfly |
| Utacapnia sierra Nebeker & Ga..., 1965 | Sierra Snowfly |
| Utacapnia tahoensis Nebeker & Ga..., 1965 | Tahoe Snowfly |
| Utacapnia trava Nebeker & Ga..., 1965 | Yellowstone Snowfly |
| Visoka cataractae Neave, 1933 | Cataract Forestfly |
| Zapada cinctipes Banks, 1897 | Common Forestfly |
| Zapada columbiana Claassen, 1923 | Columbian Forestfly |
| Zapada frigida Claassen, 1923 | Frigid Forestfly |
| Zapada haysi Ricker, 1952 | Intermountain Forestfly |
| Zapada katahdin Baumann & Mingo, 1987 | Kathadin Forestfly |
| Zapada oregonensis Claassen, 1923 | Oregon Forestfly |
